Method for adjusting gamma voltage of display module

Abstract

A method for adjusting the gamma voltage of a display module includes the steps of: obtaining a gamma voltage of the display module at a basic refresh frequency; obtaining a relationship between the gamma voltage of the display module at the basic refresh frequency and the gamma voltage of the display module at a target refresh frequency; and determining a gamma voltage of the display module at a target refresh frequency based on the gamma voltage of the display module at the basic refresh frequency and the relationship. The adjustment method realizes the use of different gamma voltages according to different refresh frequencies, and effectively improves the multi-frequency switching effect of different gray scales in the frequency switching process at the same display luminance value without occupying a large memory space on an integrated circuit chip or increasing the gamma tuning time.

Description

[Technical Field]

[0001] The present disclosure relates to the field of display technology, and in particular to a method for adjusting gamma voltages of a display module and a corresponding display module. [Background technology]

[0002] Low-Temperature Polycrystalline Oxide (LTPO) technology is one of the core technologies for display module design in the smart era. Adaptive refresh frequency, i.e., adaptively switching different refresh frequencies according to usage scenarios without changing image quality, is one of the key functions realized by LTPO display modules.

[0003] Existing LTPO display modules perform gamma tuning only in the refresh frame (high frequency), borrowing the gamma voltage of the refresh frame in the hold frame (low frequency) and adjusting the related voltage of the hold frame to reduce the difference in image quality at different frequencies. However, with the current integrated circuit (IC) design, the voltages for different grayscales at the same display brightness value (DBV) of the display module are set to the same value. As a result, the brightness difference between the high and low grayscales of the display module during the frequency switching process differs, i.e., strobe occurs.

[0004] When a display module with a strobe defect is applied to common electronic devices in daily life that contain a display screen, it will affect the user's experience. Furthermore, the strobe light on the display screen of an electronic device may also affect the user's health. For example, if the human eye is exposed to low-frequency strobe light stimulation for a long time, it can cause eye muscle fatigue, resulting in discomfort to the eyes and even the body. Summary of the Invention [Means for solving the problem]

[0005] This application provides a gamma voltage adjustment method for improving the multi-frequency switching (VRR) effect of an LTPO display module, which can use different gamma voltages according to different frequencies. This method can effectively improve the VRR effect of different grayscales in the frequency switching process at the same DBV without occupying large IC storage space or increasing the gamma tuning time.

[0006] At least one embodiment of the present application provides a method for adjusting a gamma voltage of a display module, including the steps of obtaining a gamma voltage of the display module at a basic refresh frequency, obtaining a correlation relationship between the gamma voltage of the display module at the basic refresh frequency and the gamma voltage of the display module at a target refresh frequency, and determining a gamma voltage of the display module at the target refresh frequency based on the gamma voltage of the display module at the basic refresh frequency and the correlation relationship.

[0007] For example, in the adjusting method provided by one embodiment of the present application, the association relationship corresponds to the display brightness value of the display module, and different display brightness values ​​have corresponding association relationships.

[0008] For example, an adjustment method provided by one embodiment of the present application further includes a step of determining a current display brightness value of the display module, wherein the step of obtaining a gamma voltage of the display module at the basic refresh frequency includes a step of obtaining a gamma voltage of the display module at the basic refresh frequency at the current display brightness value, and the step of obtaining a correlation relationship between the gamma voltage of the display module at the basic refresh frequency and the gamma voltage of the display module at the target refresh frequency includes a step of obtaining a correlation relationship between the gamma voltage of the display module at the basic refresh frequency at the current display brightness value and the gamma voltage of the display module at the target refresh frequency.

[0009] For example, in an adjustment method provided by one embodiment of the present application, the associated relationship includes a proportional relationship, and the step of obtaining the associated relationship between the gamma voltage of the display module at the basic refresh frequency at the current display luminance value and the gamma voltage of the display module at the target refresh frequency includes the step of obtaining, for each of a plurality of grayscales, a proportional relationship between the gamma voltage of the grayscale at the basic refresh frequency at the current display luminance value and the gamma voltage of the grayscale at the target refresh frequency.

[0010] For example, in the adjustment method provided by one embodiment of the present application, the proportionality is:

number

number

number

number

[0011] For example, in an adjustment method provided by one embodiment of the present application, the proportional relationship is a gamma ratio, and the step of obtaining the proportional relationship between the gamma voltage of the grayscale of the display module at the basic refresh frequency at the current display luminance value and the gamma voltage of the grayscale of the display module at the target refresh frequency includes the steps of obtaining gamma ratios of at least two specific grayscales among the multiple grayscales, where the gamma ratio indicates the ratio between the gamma voltage of the grayscale of the display module at the basic refresh frequency at the current display luminance value and the gamma voltage of the corresponding graycase of the display module at the target refresh frequency, and interpolating based on the gamma ratios of the at least two specific grayscales to obtain the gamma ratios of each of the multiple graycases.

[0012] For example, in an adjustment method provided by one embodiment of the present application, the proportional relationship is a gamma ratio, and the step of obtaining the proportional relationship between the gamma voltage of the grayscale at the basic refresh frequency at the current display luminance value and the gamma voltage of the grayscale at the target refresh frequency includes the steps of: determining, for each of a plurality of grayscales, at least two non-basic refresh frequencies from the basic refresh frequency and a plurality of non-basic refresh frequencies that are close to the target refresh frequency; and obtaining, for each of the at least two non-basic refresh frequencies, a gamma ratio of the non-basic refresh frequency, wherein the gamma ratio indicates the ratio between the gamma voltage of the grayscale of the display module at the basic refresh frequency at the current display luminance value and the gamma voltage of the corresponding grayscale of the display module at the non-basic refresh frequency; and obtaining the gamma ratio of the target refresh frequency by interpolating based on the gamma ratios of the at least two non-basic refresh frequencies.

[0013] For example, in an adjustment method provided by one embodiment of the present application, the step of determining the gamma voltage of the display module at the target refresh frequency based on the gamma voltage of the display module at the basic refresh frequency and the related relationship includes the step of determining, for each of a plurality of grayscales at the current display brightness value of the display module, the gamma voltage of the grayscale at the target refresh frequency based on the product of the gamma voltage of the grayscale at the basic refresh frequency and the proportional relationship between the gamma voltage of the grayscale at the basic refresh frequency and the gamma voltage of the grayscale at the target refresh frequency.

[0014] For example, in an adjustment method provided by one embodiment of the present application, the association relationship includes a polynomial relationship, and the step of obtaining the association relationship between the gamma voltage of the display module at the basic refresh frequency at the current display luminance value and the gamma voltage of the display module at the target refresh frequency includes the step of obtaining a plurality of coefficients of a polynomial to indicate a voltage relationship curve between the gamma voltage of each grayscale of the display module at the basic refresh frequency at the current display luminance value and the gamma voltage of each corresponding grayscale of the display module at the target refresh frequency.

[0015] For example, in the adjustment method provided by one embodiment of the present application, the polynomial relationship is:

number

number

number

number

number

number

[0016] For example, in an adjustment method provided by one embodiment of the present application, the step of determining the gamma voltage of the display module at the target refresh frequency based on the gamma voltage of the display module at the basic refresh frequency and the associated relationship includes the step of determining the gamma voltage of each gray scale at the target refresh frequency based on the respective gamma voltages of the multiple gray scales at the basic refresh frequency and multiple coefficients at the current display brightness value of the display module.

[0017] At least one embodiment of the present application provides a method for determining a relationship between gamma voltages of display modules, including steps of measuring gamma voltages of the display modules at a basic refresh frequency, measuring gamma voltages of the display modules at one or more non-basic refresh frequencies, and determining a relationship between the gamma voltages of the display modules based on the gamma voltages of the display modules at the basic refresh frequency and the gamma voltages of the display modules at the one or more non-basic refresh frequencies.

[0018] For example, in the determination method provided by one embodiment of the present application, the association relationship corresponds to the display brightness value of the display module, and different display brightness values ​​have corresponding association relationships.

[0019] For example, a determination method provided by one embodiment of the present application further includes a step of measuring a current display luminance value of the display module, wherein the step of measuring the gamma voltage of the display module at a basic refresh frequency includes a step of measuring gamma voltages of multiple gray scales of the display module at the basic refresh frequency at the current display luminance value, and the step of measuring the gamma voltage of the display module at one or more non-basic refresh frequencies includes a step of measuring, for each of the one or more non-basic refresh frequencies, gamma voltages of multiple gray scales of the display module at the non-basic refresh frequency at the current display luminance value.

[0020] For example, in a determination method provided by one embodiment of the present application, the associated relationship includes a proportional relationship, and the step of determining the associated relationship between the gamma voltages of the display module based on the gamma voltages of the display module at the basic refresh frequency and the gamma voltages of the display module at one or more non-basic refresh frequencies includes the step of determining, for each of the one or more non-basic refresh frequencies, a gamma ratio indicating the ratio between the gamma voltages of multiple grayscales at the basic refresh frequency at the current display brightness value and the gamma voltages of each corresponding grayscale at the non-basic refresh frequency.

[0021] For example, in a determination method provided by one embodiment of the present application, the associated relationship includes a proportional relationship, and the step of determining the associated relationship between the gamma voltages of the display module based on the gamma voltages of the display module at the basic refresh frequency and the gamma voltages of the display module at one or more non-basic refresh frequencies includes the step of determining, for each of a plurality of grayscales, a gamma ratio indicating the ratio between the gamma voltage of the grayscale at the basic refresh frequency at the current display brightness value and the gamma voltage of the grayscale at the one or more non-basic refresh frequencies.

[0022] For example, in a determination method provided by one embodiment of the present application, the association relationship includes a polynomial relationship, and the step of determining the association relationship between the gamma voltages of each of the multiple grayscales at the basic refresh frequency at the current display luminance value and the gamma voltages of each of the multiple grayscales at one or more non-basic refresh frequencies includes the step of determining multiple coefficients of a polynomial to represent a voltage relationship curve between the gamma voltages of the multiple grayscales of the display module at the basic refresh frequency at the current display luminance value and the gamma voltages of the corresponding multiple grayscales of the display module at the one or more non-basic refresh frequencies.

[0023] At least one embodiment of the present application provides a display device comprising a memory and a processor coupled to the memory, the processor configured to obtain a gamma voltage of the display device at a basic refresh frequency, obtain a correlation between the gamma voltage of the display device at the basic refresh frequency and the gamma voltage of the display device at a target refresh frequency, and determine a gamma voltage of the display device at the target refresh frequency based on the gamma voltage of the display device at the basic refresh frequency and the correlation. [Brief explanation of the drawings]

[0024] In order to more clearly describe the technical solutions in the embodiments of the present disclosure, the following briefly introduces drawings of the embodiments. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure.

[0025] [Figure 1A] FIG. 1 is a timing diagram of an LTPO display module driven at a low refresh frequency. [Figure 1B] FIG. 1 is a diagram illustrating the principle of brightness differences between different gray scales of an LTPO display module at high and low refresh frequencies. [Figure 1C]1 is a graph showing the measured brightness difference of different gray scales of an LTPO display module at high and low refresh frequencies; [Figure 2] FIG. 10 is a schematic diagram of a method for storing gamma voltages for each gray scale at different refresh frequencies with different DBVs. [Figure 3] 1 is a flowchart of a method for adjusting gamma voltage of an LTPO display module to improve VRR effect according to an example embodiment of the present disclosure. [Figure 4A] FIG. 10 is a schematic diagram illustrating a proportional relationship between the gamma voltages of gray scales at non-basic refresh frequencies and the gamma voltages of corresponding gray scales at basic refresh frequencies at the same DBV according to an embodiment of the present disclosure. [Figure 4B] FIG. 4B is a schematic diagram illustrating a method for determining gamma voltages for each gray scale at a non-basic refresh frequency using the proportional relationship of FIG. 4A according to an embodiment of the present disclosure. [Figure 4C] FIG. 4B is a schematic diagram illustrating another method for determining gamma voltages for each gray scale at a non-basic refresh frequency using the proportional relationship of FIG. 4A according to an embodiment of the present disclosure. [Figure 5] FIG. 10 is a schematic diagram illustrating the relationship between the difference between the gamma voltages of different gray scales at a non-basic refresh frequency and the gamma voltages of different gray scales at a basic refresh frequency according to an embodiment of the present disclosure. [Figure 6] 10 is a flowchart of a method for determining an association relationship between a gamma voltage of each gray scale at a basic refresh frequency and a gamma voltage of each gray scale at a non-basic refresh frequency according to an embodiment of the present disclosure. [Figure 7A] FIG. 10 is a schematic diagram of a method for determining a proportional relationship between a gamma voltage for each gray scale at a basic refresh frequency and a gamma voltage for each gray scale at a non-basic refresh frequency according to an embodiment of the present disclosure. [Figure 7B]FIG. 10 is a schematic diagram of a method for determining a proportional relationship between a gamma voltage for each gray scale at a basic refresh frequency and a gamma voltage for each gray scale at a non-basic refresh frequency according to an embodiment of the present disclosure. [Figure 8A] 1 is a schematic diagram of a display device for implementing a method for adjusting the gamma voltage of an LTPO display module according to an embodiment of the present disclosure; [Figure 8B] 1 is a schematic diagram of a display device for implementing a method for adjusting the gamma voltage of an LTPO display module according to an embodiment of the present disclosure; [Figure 9] FIG. 10 is a graph showing the measured effect of applying a method for adjusting the gamma voltage of an LTPO display module to improve the VRR effect according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0026] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the following clearly and completely describes the technical solutions of the embodiments of the present disclosure in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are some embodiments of the present disclosure, but not all embodiments. Based on the described embodiments of the present disclosure, other embodiments that a person skilled in the art can obtain without creative work all belong to the protection scope of the present disclosure.

[0027] Unless otherwise defined, technical or scientific terms used in this disclosure should have their ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The words "first," "second," and similar terms used in this disclosure do not denote any order, quantity, or importance, but are merely used to distinguish between different components. Similarly, similar terms such as "one," "an," or "the" do not denote a limitation of quantity, but rather indicate the presence of at least one. Similar terms such as "comprise" or "comprises" mean that the element or thing preceding the term includes the element or thing listed thereafter, and equivalents thereof, but do not exclude other elements or things. Similar terms such as "connect" or "interconnect" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "top," "bottom," "left," "right," and the like are merely used to indicate relative positions; if the absolute positions of the objects being described are changed, the relative positions may change accordingly.

[0028] FIG. 1A is a timing diagram of an LTPO display module driven at a low refresh frequency. As shown in FIG. 1A, the LTPO display module may be driven using a combination of refresh frames and hold frames. A refresh frame refers to a frame in which pixel data is updated, and a hold frame refers to a frame in which pixel data is not updated (i.e., only maintained). Taking a low refresh frequency mode of 10 Hz as an example, FIG. 1A shows a reference frequency (i.e., basic refresh frequency) of 120 Hz, with one cycle including one refresh frame and 11 hold frames. In FIG. 1A, TE-sync is a frame synchronization signal, TE-test indicates a refresh frame, and the GOA signal indicates switching of an action.

[0029] 1B shows the principle of brightness difference between different gray scales of an LTPO display module at high and low refresh frequencies. A high refresh frequency usually refers to a refresh frequency higher than 80 Hz, and a low refresh frequency usually refers to a refresh frequency lower than 60 Hz.

[0030] As shown in FIG. 1B, in a refresh frame, the data voltage Data(n) is updated, the source voltage of transistor T2 (shown as node N3 in the figure) is refreshed, and Gate-N(n) turns on transistor T2 to transfer the data voltage to capacitor C st In the hold frame, the data voltage Data(n) is not updated, and Gate-N(n) turns off transistor T2 and sets the data voltage to C st However, during the hold frame, Gate-N(n) is closed and the source voltage Data(n) is not refreshed, resulting in a difference in the voltage at node N3 between the refresh frame and the hold frame. Specifically, the voltage at node N3 is higher during the hold frame, causing transistor T6 to turn on early and precharge node N4, which increases the voltage at node N4 during the hold frame. As a result, the LTPO display module experiences a brightness difference between the hold frame and the refresh frame. Therefore, if the source voltage does not change during the refresh frequency switching process, the difference in the voltage at node N3 and node N4 between the refresh frame and the hold frame will cause screen flickering at low refresh frequencies and screen flickering during the switching process between high and low refresh frequencies. In FIG. 1B, EM(n) is a light emission control signal supplied to the gates of transistors T5 and T6, Reset_N(n) is a reset signal, Gate-P(n) is a gate control signal for transistors T4 and T7, node N1 is connected to the gate of transistor T3, and Vinit1 and Vinit2 are initial setting signals.

[0031] Figure 1C shows the measured brightness difference between different grayscales of an LTPO display module at high and low refresh frequencies. As shown in Figure 1C, there is a brightness difference between different grayscales at a refresh frequency of 120 Hz and a refresh frequency of 10 Hz with the same DBV. The horizontal axis represents the grayscale, and the vertical axis represents the brightness difference. Specifically, as the grayscale increases, the brightness difference between the 120 Hz and 10 Hz grayscales gradually decreases.

[0032] Due to the unavoidable effects of the TFT manufacturing process, the pixel circuit of an LTPO display module generates a certain disturbance current ΔI. High gray scales have high brightness and a large current I1, while low gray scales have low brightness and a small current I2, i.e., I1 > I2. The influence of the disturbance current ΔI on high gray scales and low gray scales is ΔI / I1 < ΔI / I2, respectively, i.e., the influence of the disturbance current on high gray scales is small and the influence of the disturbance current on low gray scales is large. Therefore, when switching at the same DBV refresh frequency, there is a large difference in brightness and color between high gray scales and low gray scales.

[0033] In the existing LTPO driving method, different gray scales at the same DBV have different source voltages, but the driving voltages of other nodes are all the same. However, this driving method cannot meet the requirement of small luminance and chromaticity differences between high and low gray scales when switching refresh frequencies at the same DBV. Reducing the voltage difference at node N4 between high and low refresh frequencies is an effective way to improve the luminance difference between different gray scales when switching refresh frequencies at the same DBV.

[0034] By applying different gamma voltages to different gray scales at different refresh frequencies, the voltages of the high gray scale and the low gray scale at node N4 can be changed, which changes the voltage difference of the changed N4 point between the high refresh frequency and the low refresh frequency, thereby improving the brightness difference between the high gray scale and the low gray scale in the refresh frequency switching process at the same DBV.

[0035] In some embodiments, gamma voltages for different grayscales at different refresh frequencies in different DBVs can be stored and read as needed depending on actual usage. Figure 2 is a schematic diagram showing a method for storing gamma voltages for each grayscale at different refresh frequencies in different DBVs. Specifically, gamma tuning is performed at different refresh frequencies for different DBVs to determine gamma voltages for each grayscale at different refresh frequencies in different DBVs, and the determined gamma voltages are stored in a chip IC. When the LTPO display module switches from a current refresh frequency to another refresh frequency in a certain DBV, the stored gamma voltages for each grayscale at the other refresh frequency are read from the IC and applied to improve the VRR effect during the switching process from the current refresh frequency to another refresh frequency.

[0036] The IC may store gamma voltages of multiple gray scales at multiple different refresh frequencies corresponding to multiple DBVs. In one example, when the current refresh frequency of the LTPO display module is 120 Hz and the display module is switched to a refresh frequency of 30 Hz, gamma voltages of different gray scales at a refresh frequency of 30 Hz corresponding to the current DBVs of the LTPO display module can be read from the IC and applied.

[0037] By using different refresh frequencies to invoke different gray scale gamma voltages at each refresh frequency, the brightness difference between different gray scales at the same DBV during the refresh frequency switching process can be effectively improved, thereby effectively improving the image quality level of the LTPO display module and improving the VRR effect of the LTPO display module.

[0038] However, because LTPO display modules need to switch between multiple refresh frequencies, performing gamma tuning for each refresh frequency requires a large amount of gamma tuning time and requires adding extra storage bases to the IC to store related data, such as gamma voltages for different grayscales at different refresh frequencies obtained by gamma tuning, which significantly increases the manufacturing cost of LTPO display modules. Therefore, it is necessary to find an effective and reasonable way to solve the problems of gamma tuning for multiple refresh frequencies and related data storage.

[0039] Therefore, the present disclosure provides an adjustment method for optimizing the VRR effect of an LTPO display module, which allows different gamma voltages to be used for different gray scales at different refresh frequencies without occupying large storage space in the IC or requiring excessively long gamma tuning times. This method can effectively improve the VRR effect for different gray scales when switching refresh frequencies at the same DBV, and by balancing the voltage of node N4 of the pixel circuit between high and low gray scales, the luminance difference between high and low gray scales between the refresh frame and the hold frame can be effectively reduced.

[0040] FIG. 3 is a flowchart of a method for adjusting the gamma voltage of an LTPO display module to improve the VRR effect according to an example embodiment of the present disclosure.

[0041] As shown in Figure 3, in 301, gamma voltages for each gray scale of an LTPO display module at a basic refresh frequency are obtained. The LTPO display module can have multiple different DBVs, and multiple gray scales at different refresh frequencies with different DBVs have different gamma voltages. Specifically, the gamma voltages for each gray scale of an LTPO display module at different DBVs and basic refresh frequencies are stored in an IC. Therefore, when it is necessary to obtain the gamma voltages for each gray scale of an LTPO display module at a basic refresh frequency, the current DBV of the LTPO display module is first determined, and then the gamma voltages for each gray scale at the basic refresh frequency corresponding to the current DBV are obtained from the IC.

[0042] In 303, obtain a relational relationship between the gamma voltage of each gray scale of the LTPO display module at the basic refresh frequency and the gamma voltage of each gray scale of the LTPO display module at the target refresh frequency.

[0043] In some embodiments, the related relationship may be a proportional relationship. In one example, the proportional relationship may represent a proportional relationship between a gamma voltage of a gray scale at a fundamental refresh frequency and a gamma voltage of the gray scale at a non-fundamental refresh frequency at the same DBV. For example, the proportional relationship may be:

number

number

number

number

[0044] In some other embodiments, the relation may be a polynomial relation. In one example, the polynomial relation may represent the difference between the gamma voltage of a grayscale at a basic refresh frequency and the gamma voltage of the grayscale at a non-basic refresh frequency at the same DBV. The polynomial relation may be:

number

number

[0045] Next, in 305, the gamma voltages of each gray scale at the target refresh frequency are determined based on the gamma voltages of each gray scale at the basic refresh frequency and the associated relationships.

[0046] When the related relationship is a proportional relationship, the gamma voltage of each gray scale at the target refresh frequency may be the product of the gamma voltage of each gray scale at the basic refresh frequency and the gamma ratio.

[0047] If the association relation is a polynomial relation, first

number

number

number

[0048] Several embodiments of the present disclosure will now be described in detail with reference to Figures 4-5, where the same or similar symbols in different figures are used to refer to the same elements illustrated.

[0049] 4A is a schematic diagram illustrating a proportional relationship between the gamma voltage of a gray scale at a non-basic refresh frequency and the gamma voltage of a corresponding gray scale at a basic refresh frequency at the same DBV according to an embodiment of the present disclosure. This proportional relationship may be expressed by the following formula:

number

[0050] where:

number

number

number

[0051] For the same gray scale at the same DBV, it has different gamma ratios at different non-basic refresh frequencies. As shown in Figure 4A, the gamma voltage of a certain gray scale at the same DBV and a basic refresh frequency of 120Hz is gamma 1, the gamma ratio between the gamma voltage of the gray scale at a non-basic refresh frequency 1 of 60Hz and the gamma voltage of the gray scale at a basic refresh frequency of 120Hz is gamma ratio 1, the gamma ratio between the gamma voltage of the gray scale at a non-basic refresh frequency 2 of 30Hz and the gamma voltage of the gray scale at a basic refresh frequency of 120Hz is gamma ratio 2, the gamma ratio between the gamma voltage of the gray scale at a non-basic refresh frequency 3 of 10Hz and the gamma voltage of the gray scale at a basic refresh frequency of 120Hz is gamma ratio 3. By analogy, the gamma ratio between the gamma voltage of the gray scale at a non-basic refresh frequency n of xHz and the gamma voltage of the gray scale at a basic refresh frequency of 120Hz is gamma ratio n.

[0052] FIG. 4B is a schematic diagram illustrating a method for determining gamma voltages for each gray scale at a non-basic refresh frequency using the proportional relationship of FIG. 4A according to an embodiment of the present disclosure.

[0053] In Figure 4B, the horizontal axis represents the gamma ratio, and the vertical axis represents the gamma voltage. As shown in Figure 4B, the same gray scale at different non-basic refresh frequencies with the same DBV has different gamma ratios.

[0054] In some embodiments, when the LTPO display module is switched to a non-basic refresh frequency, i.e., a target refresh frequency, first determine the current DBV of the LTPO display module, then obtain the gamma voltages of the gray scales at the basic refresh frequency at the current DBV stored in the IC and the gamma ratios of the multiple combined point gray scales at the target refresh frequency, and obtain the gamma ratios corresponding to the non-combined point gray scales by linear interpolation. Then determine the gamma voltages of the multiple gray scales at the target refresh frequency by multiplying the gamma voltages of the multiple gray scales at the basic refresh frequency by the gamma ratios of the corresponding gray scales obtained by the interpolation operation.

[0055] In one example, the current refresh frequency of the TPO display module is 120 Hz, and the target refresh frequency is 30 Hz. First, the current DBV of the LTPO display module is determined, and the gamma ratio of the combined grayscale at the 30 Hz refresh frequency corresponding to the current DBV is obtained from the IC. For example, the combined grayscales may be 0, 16, 32, 64, 128, and 255, and the gamma ratios of these grayscales may be obtained. The gamma ratios of non-combined grayscales not stored in the IC may be obtained by linear interpolation. For example, the gamma ratio of combined grayscale 0 is gamma ratio 1, and the gamma ratio of combined grayscale 16 is gamma ratio 2. Then, the gamma ratios of the other grayscales between grayscale 0 and grayscale 16 may be obtained by linear interpolation. Specifically, the gamma ratio of grayscale 4 may be calculated using the following equation:

number

[0056] where:

number

number

number

[0057] After the gamma ratio of each grayscale at the target refresh frequency is obtained, the equation

number

number

[0058] FIG. 4C is a schematic diagram illustrating another method for determining gamma voltages for each gray scale at a non-basic refresh frequency using the proportional relationship of FIG. 4A according to an embodiment of the present disclosure.

[0059] In Figure 4C, the horizontal axis represents the gray scale, and the vertical axis represents the gamma ratio. As shown in Figure 4C, different gray scales at the same non-basic refresh frequency with the same DBV have different gamma ratios.

[0060] In some embodiments, when the LTPO display module is switched to a non-basic refresh frequency, i.e., a target refresh frequency, and a gamma ratio corresponding to the target refresh frequency is stored in the IC (i.e., the target refresh frequency is one of several non-basic refresh frequencies), the stored gamma ratio can be directly retrieved to determine the gamma voltage of the gray scale at the target refresh frequency. Specifically, the current DBV of the LTPO display module is first determined, and then the gamma voltage of the gray scale at the basic refresh frequency at the current DBV stored in the IC and the gamma ratio corresponding to the target refresh frequency are directly obtained, and the gamma voltage of the gray scale at the target refresh frequency can be determined by multiplying the gamma voltage of the gray scale at the basic refresh frequency by the gamma ratio.

[0061] In one example, the IC stores grayscale gamma ratios at different DBVs and refresh frequencies of 10 Hz, 30 Hz, 60 Hz, and 90 Hz, and the current refresh frequency of the LTPO display module is 120 Hz and the target refresh frequency is 30 Hz. Since the grayscale gamma ratios at different DBVs and a 30 Hz refresh frequency are stored in the IC, the gamma ratios can be directly obtained and the corresponding gamma voltages can be calculated. First, the current DBV of the LTPO display module is determined, and the grayscale gamma ratios at the target refresh frequency of 30 Hz and the grayscale gamma voltages at the base refresh frequency corresponding to the current DBV stored in the IC are obtained. Then, the equation

number

[0062] In some other embodiments, when the LTPO display module is switched to a non-basic refresh frequency, i.e., a target refresh frequency, and the gamma ratio corresponding to the target refresh frequency is not stored in the IC (i.e., the target refresh frequency is not a non-basic refresh frequency at the coupling point), a linear interpolation operation is performed to obtain the gamma ratio corresponding to the target refresh frequency, and the grayscale gamma voltage at the target refresh frequency can be determined. Specifically, the current DBV of the LTPO display module is first determined, and then the grayscale gamma voltage at the basic refresh frequency at the current DBV stored in the IC and the gamma ratios corresponding to some non-basic refresh frequencies are obtained, and the linear interpolation operation is performed to obtain the gamma ratio corresponding to the target refresh frequency, and the grayscale gamma voltage at the target refresh frequency can be determined by multiplying the grayscale gamma voltage at the basic refresh frequency by the gamma ratio obtained by the interpolation operation.

[0063] In one example, the IC stores grayscale gamma ratios for different DBVs at refresh frequencies of 10 Hz, 30 Hz, 60 Hz, and 90 Hz, where the current refresh frequency of the LTPO display module is 120 Hz and the target refresh frequency is 50 Hz. Because the grayscale gamma ratios for different DBVs at a refresh frequency of 50 Hz are not stored in the IC, the grayscale gamma voltage for the refresh frequency of 50 Hz needs to be obtained by linear interpolation. For example, the grayscale gamma ratio for the refresh frequency of 30 Hz is gamma ratio 3, and the grayscale gamma ratio for the refresh frequency of 60 Hz is gamma ratio 4. Then, the corresponding grayscale gamma voltage for the refresh frequency of 50 Hz may be calculated by the following equation:

number

[0064] where:

number

number

number

number

[0065] FIG. 5 is a schematic diagram illustrating the relationship between the difference between the gamma voltages of different gray scales at a non-basic refresh frequency and the gamma voltages of different gray scales at a basic refresh frequency according to an embodiment of the present disclosure.

[0066] The relationship shown in FIG. 5 may be expressed by the following polynomial:

number

[0067] where:

number

[0068] In some embodiments, when the LTPO display module is switched to a non-base refresh frequency, i.e., a target refresh frequency, the polynomial

number

number

number

[0069] In one example, the IC stores polynomial coefficients a, b, and c for refresh frequencies of 10 Hz, 30 Hz, 60 Hz, and 90 Hz, respectively. The current refresh frequency of the LTPO display module is 120 Hz, and the target refresh frequency is 30 Hz. Since the polynomial coefficients a, b, and c for the target refresh frequency of 30 Hz are stored in the IC, the coefficients can be directly obtained and

number

number

[0070] In another example, polynomial coefficients a, b, and c for refresh frequencies of 10 Hz, 30 Hz, 60 Hz, and 90 Hz are stored in an IC. The current refresh frequency of an LTPO display module is 120 Hz, and the target refresh frequency is 50 Hz. Because the polynomial coefficients a, b, and c for the target refresh frequency of 50 Hz are not stored in the IC, the polynomial coefficients a, b, and c for the 50 Hz refresh frequency must be obtained by linear interpolation. Specifically, first, the polynomial coefficients a1, b1, and c1 for the 30 Hz refresh frequency and the polynomial coefficients a2, b2, and c2 for the 60 Hz refresh frequency are obtained. Then, the polynomial coefficient a3 for the target refresh frequency of 50 Hz can be calculated by linear interpolation using the following formula:

number

[0071] Similarly, the coefficients b3 and c3 of the polynomial at a target refresh frequency of 50 Hz are

number

number

[0072] The determination of the association relationship in the above embodiment of the present disclosure will be described below with reference to FIGS.

[0073] FIG. 6 is a flowchart of a method for determining an association relationship between the gamma voltage of each gray scale at the basic refresh frequency and the gamma voltage of each gray scale at a non-basic refresh frequency according to an embodiment of the present disclosure.

[0074] As shown in Figure 6, in 601, the gamma voltage of each gray scale of the LTPO display module at the basic refresh frequency is measured. The LTPO display module can have multiple different DBVs, and multiple gray scales at different refresh frequencies in different DBVs have different gamma voltages. Specifically, gamma tuning is performed at the basic refresh frequency for the different DBVs to obtain the gamma voltage of each gray scale at the basic refresh frequency in the different DBVs.

[0075] In 603, the gamma voltage of each gray scale of the LTPO display module at one or more non-basic refresh frequencies is measured. Specifically, for each of one or more non-basic refresh frequencies, gamma tuning is performed at the non-basic refresh frequency in different DBVs, and the gamma voltage of each gray scale at the non-basic refresh frequency in different DBVs is obtained.

[0076] In 605, based on the gamma voltage of each gray scale of the LTPO display module at the basic refresh frequency and the gamma voltage of the corresponding gray scale at one or more non-basic refresh frequencies, a relational relationship between the gamma voltages of the display module is determined.

[0077] In some embodiments, it can be determined that for each of one or more non-basic refresh frequencies, there is a proportional relationship between the gamma voltage of each grayscale at the basic refresh frequency at the same DBV and the gamma voltage of the corresponding grayscale at the non-basic refresh frequency. Alternatively, it can be determined that for each grayscale, there is a proportional relationship between the gamma voltage of the grayscale at the basic refresh frequency at the same DBV and the gamma voltage of the grayscale at one or more non-basic refresh frequencies. The proportional relationship can be

number

[0078] In some other embodiments, for each of one or more non-basic refresh frequencies, it can be determined that the difference between the gamma voltage of each gray scale at the basic refresh frequency in different DBVs and the gamma voltage of the corresponding gray scale at the non-basic refresh frequency follows a polynomial relationship.

number

[0079] 7A and 7B are schematic diagrams illustrating a method for determining a proportional relationship between the gamma voltages of each gray scale at a basic refresh frequency and the gamma voltages of each gray scale at one or more non-basic refresh frequencies according to an embodiment of the present disclosure.

[0080] FIG. 7A is a schematic diagram for determining, for each of one or more non-basic refresh frequencies, the proportional relationship between the gamma voltage of each gray scale at the basic refresh frequency at the same DBV and the gamma voltage of the corresponding gray scale at the non-basic refresh frequency.

[0081] 7A, for each of a plurality of DBVs, gamma tuning is performed at a basic refresh frequency to determine gamma voltages for a plurality of grayscales at the basic refresh frequency for the DBV. For each of one or more non-basic refresh frequencies, gamma tuning is performed at the non-basic refresh frequency to determine gamma voltages for corresponding grayscales at the non-basic refresh frequency for the DBV. For the same DBV, for each of one or more non-basic refresh frequencies, a proportional relationship is determined between the gamma voltages for each grayscale at the basic refresh frequency and the gamma voltages for corresponding grayscales at the non-basic refresh frequency. The proportional relationship may be expressed by the following equation:

number

[0082] where:

number

number

number

[0083] Since an LTPO display module can have multiple different DBVs and can switch between multiple different refresh frequencies, if the gamma ratios for each gray scale at different refresh frequencies for different DBVs are all stored in an IC, a large data storage base would be required.

[0084] In an actual manufacturing process, in order to shorten the gamma tuning time for each device and reduce the storage space required for the IC, in a certain DBV, for each of one or more non-basic refresh frequencies, only the gamma ratios of some specific grayscales among the grayscales at the non-basic refresh frequencies can be stored in the IC. Some specific grayscales that can be called grayscale combination points are selected from each grayscale, and some specific grayscales can also be called grayscale combination points.

[0085] In some embodiments, the basic refresh frequency is 120 Hz, and each of the one or more non-basic refresh frequencies is 30 Hz. The coupling point of the non-basic refresh frequency of 30 Hz may be determined as follows: Gamma tuning is performed at the basic refresh frequency of 120 Hz, and the gamma voltage gamma for each gray scale at 120 Hz is 120 0, gamma 120 1,......,gamma 120 255, and at the same DBV, perform gamma tuning at a non-basic refresh frequency of 30 Hz, and determine the gamma voltage gamma of the corresponding gray scale at 30 Hz. 30 0, gamma 30 1,......,gamma 30255 is determined, and gamma ratios 0, 1, ..., 255 are calculated for the gamma voltages of each grayscale at 30 Hz and the corresponding grayscale at 120 Hz. To select a connecting point grayscale from multiple grayscales, the gamma ratios of the connecting point grayscales may be expressed as a piecewise linear function. For example, a point on the linear function determined by gamma ratio 0 and gamma ratio 15 can better cover gamma ratios 1 to 14. Therefore, grayscale 0 and grayscale 15, corresponding to gamma ratio 0 and gamma ratio 15, may be selected as connecting point grayscales. Other connecting point grayscales at 30 Hz can be determined in this manner. Connecting point grayscales at other non-basic refresh frequencies may be determined in a similar manner.

[0086] FIG. 7B is a schematic diagram showing determining, for each gray scale, the proportional relationship between the gamma voltage of the gray scale at the fundamental refresh frequency and the gamma voltage of the gray scale at one or more non-fundamental refresh frequencies at the same DBV.

[0087] 7B, for each of a plurality of DBVs, gamma tuning is performed at the basic refresh frequency to determine gamma voltages for a plurality of grayscales at the basic refresh frequency for the DBV. For each of the plurality of grayscales, it has a different gamma ratio at different non-basic refresh frequencies for the same DBV. For each of the plurality of grayscales for the same DBV, a proportional relationship is determined between the gamma voltage for the grayscale at the basic refresh frequency and the gamma voltage for the grayscale at one or more non-basic refresh frequencies. The proportional relationship may also be expressed by the following equation:

number

[0088] where:

number

number

number

[0089] Since an LTPO display module can have multiple different DBVs and can switch between multiple different refresh frequencies, if the gamma ratios for each gray scale at different refresh frequencies for different DBVs are all stored in an IC, a large data storage base would be required.

[0090] In an actual manufacturing process, in order to shorten the gamma tuning time and reduce the storage space required for the IC, in a certain DBV, for each grayscale, only the gamma ratio of the grayscale at some specific non-basic refresh frequencies among one or more non-basic refresh frequencies can be stored in the IC. Among the one or more non-basic refresh frequencies, some specific non-basic refresh frequencies may be called non-basic refresh frequency coupling points, and some specific non-basic refresh frequencies may be called non-basic refresh frequency coupling points.

[0091] In some embodiments, the basic refresh frequency is 120 Hz, and the multiple non-basic refresh frequencies may include 5 Hz, 10 Hz, 15 Hz, ..., 105 Hz, 110 Hz, and 115 Hz. Taking grayscale 128 as an example, the non-basic refresh frequency of the multiple non-basic refresh frequencies may be determined as follows: Gamma tuning is performed at the basic refresh frequency of 120 Hz, and the gamma voltage gamma of each grayscale at 120 Hz is 120 0, gamma 120 1,......,gamma 120 255, and the gamma voltage for grayscale 128 is gamma 120 128, and by performing gamma tuning at 5Hz, 10Hz, 15Hz, ......, 105Hz, 110Hz, 115Hz respectively at the same DBV, the gamma voltage of each gray scale at multiple non-basic refresh frequencies is determined, and the gamma voltage of gray scale 128 at multiple non-basic refresh frequencies is gamma5128, gamma 10 128, gamma 15 128,...,gamma 105 128, gamma 110 128 sum gamma 115 128, and the gamma ratio between the gamma voltage of the gray scale 128 at each non-basic refresh frequency and the gamma voltage of the gray scale 128 at 120 Hz is 5128, and the gamma ratio 10 128,......, gamma ratio 115 128. In order to select a non-basic refresh frequency at the coupling point from a plurality of non-basic refresh frequencies, the gamma ratio of the non-basic refresh frequency at the coupling point may be expressed by a piecewise linear function. For example, the gamma ratio 10 128 and gamma ratio 30 The points on the linear function determined by 128 are the gamma ratios 10 128 and gamma ratio 30 It is possible to better cover the gamma ratio of gray scale 128 at each non-basic refresh frequency between 128 and 128. Therefore, the gamma ratio 10 128 and gamma ratio 30The non-basic refresh frequencies of 10 Hz and 30 Hz, which correspond to 128, may be selected as the joint non-basic refresh frequencies.

[0092] Returning to FIG. 5, a method for determining the polynomial relationship between the gamma voltages of each gray scale at the basic refresh frequency and the gamma voltages of each gray scale at the non-basic refresh frequency will now be described with reference to FIG.

[0093] In order to be able to use different gamma voltages for different gray scales at different refresh frequencies without occupying a large storage space of an IC and without requiring much gamma tuning time, an interpolated polynomial relationship between the gamma voltages for different gray scales at a basic refresh frequency and the gamma voltages for different gray scales at a non-basic refresh frequency can be established, and the gamma voltages for different gray scales at the non-basic refresh frequency can be determined based on the established polynomial relationship.

[0094] Gamma tuning is performed at the basic refresh frequency and the non-basic refresh frequency, and gamma voltages of different gray scales at the basic refresh frequency and gamma voltages of different gray scales at the non-basic refresh frequency are determined, and the difference therebetween is calculated.

number

number

[0095] As shown in Figure 5, there is a relationship between the difference between the gamma voltages of different gray scales at a fundamental refresh frequency of 120Hz and the gamma voltages of different gray scales at a non-basic refresh frequency of 30Hz. In Figure 5, the horizontal axis represents the gray scale, and the vertical axis represents the difference between the gamma voltages of different gray scales at a fundamental refresh frequency of 120Hz and the gamma voltages of the corresponding gray scales at a non-basic refresh frequency of 30Hz.

number

[0096] Referring to FIG. 5 , there is an obvious mathematical relationship between the differences in gamma voltages of R, G, and B components of different grayscales at a fundamental refresh frequency of 120 Hz and those at a non-fundamental refresh frequency of 30 Hz at different DBVs, and this mathematical relationship can be expressed by the following polynomial:

number

[0097] where:

number

[0098] The established polynomial relationship and the corresponding polynomial coefficients may be pre-stored in the IC. Also, the gamma voltages for different gray scales at a basic refresh frequency of 120 Hz may be pre-stored in the IC. By accessing the polynomial relationship and data related to the gamma voltages for different gray scales at the basic refresh frequency, the gamma voltages for different gray scales at non-basic refresh frequencies can be calculated using the following formula:

number

[0099] where:

number

number

[0100] However, to save storage space in the IC, not all of the polynomial coefficients a, b, and c at the non-basic refresh frequencies are stored in the IC. In some embodiments, point-wise coupling can be performed on the polynomial coefficients of multiple non-basic refresh frequencies, and the coupling point coefficients can be stored in the IC, and the multiple coupling point coefficients may be represented by piecewise linear functions.

[0101] In one example, the polynomial coefficients a, b, and c for multiple non-basic refresh frequencies are determined, and multiple coefficients are selected from among them to perform point coupling. Taking coefficient a as an example, multiple coefficients a1, a2, ..., a20 for multiple non-basic refresh frequencies are first obtained. Among the multiple coefficients a1, a2, ..., a6, a1 and a5 may be selected as coupling point coefficients a because the points on the linear coefficients determined by a1 and a5 can better cover each coefficient a between a1 and a5. Similarly, several other coupling point coefficients a can be determined in the same manner.

[0102] FIG. 8A is a schematic diagram of a display device for implementing a method for adjusting the gamma voltage of an LTPO display module according to an embodiment of the present disclosure.

[0103] As shown in FIG. 8A, the display device includes a memory and a processor coupled to the memory, and the processor is configured to obtain a gamma voltage of the display device at a basic refresh frequency, obtain a correlation between the gamma voltage of the display device at the basic refresh frequency and the gamma voltage of the display device at a target refresh frequency, and determine a gamma voltage of the display device at the target refresh frequency based on the gamma voltage of the display device at the basic refresh frequency and the correlation.

[0104] In some embodiments, the related relationship is a proportional relationship, the proportional relationship being:

number

number

number

number

[0105] In some embodiments, the association relationship is a polynomial relationship, the polynomial relationship being:

number

number

number

number

number

number

[0106] FIG. 8B is a schematic diagram of a display device for implementing the method for adjusting the gamma voltage of an LTPO display module according to an embodiment of the present disclosure.

[0107] As shown in FIG. 8B, the display device includes a storage member, an acquisition member, and a gamma voltage determination member.

[0108] The storage member is configured to store gamma voltages of the display device at the basic refresh frequency and an associated relationship between the gamma voltages of the display device at the basic refresh frequency and the gamma voltages of the display device at the target refresh frequency.

[0109] The acquisition member is configured to acquire the gamma voltage of the display device at the basic refresh frequency and the associated relationship between the gamma voltage of the display device at the basic refresh frequency and the gamma voltage of the display device at the target refresh frequency, which are stored in the memory member.

[0110] The gamma voltage determining member is configured to determine a gamma voltage of the display device at the target refresh frequency based on the obtained gamma voltage of the display device at the basic refresh frequency and the associated relationship.

[0111] 9 shows a graph illustrating the measured results of applying a method for adjusting the gamma voltage of an LTPO display module to improve the VRR effect according to an embodiment of the present disclosure. FIG. 9 illustrates gamma curves at different refresh frequencies (120 Hz, 60 Hz, 30 Hz, and 10 Hz) at a DBV of 500 nits. The left side of FIG. 9 illustrates gamma curves at different refresh frequencies (120 Hz, 60 Hz, 30 Hz, and 10 Hz) at a DBV of 500 nits. The center side illustrates gamma curves at different refresh frequencies (120 Hz, 60 Hz, 30 Hz, and 10 Hz) at a DBV of 80 nits. The right side illustrates gamma curves at different refresh frequencies (120 Hz, 60 Hz, 30 Hz, and 10 Hz) at a DBV of 25 nits.

[0112] Referring to Figure 9, the gamma curves at different refresh frequencies (120Hz, 60Hz, 30Hz, and 10Hz) at the same DBV are almost overlapped, which indicates that the actual luminance of each grayscale at different refresh frequencies at the same DBV remains unchanged. In Figure 9, nits is the luminance unit.

[0113] By implementing the method provided by the present invention, it is possible to assign different gamma voltages to different gray scales of an LTPO display module at different refresh frequencies, thereby effectively improving the brightness and chromaticity difference of different gray scales in the switching process between high and low refresh frequencies at different DBVs.

[0114] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto, and all modifications or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be governed by the scope of protection of the claims.

Claims

1. 1. A method for adjusting a gamma voltage of a display module, comprising: obtaining a gamma voltage of the display module at a basic refresh frequency; Obtaining a correlation between a gamma voltage of the display module at a basic refresh frequency and a gamma voltage of the display module at a target refresh frequency; and determining a gamma voltage of the display module at a target refresh frequency based on the gamma voltage of the display module at a basic refresh frequency and the related relationship.

2. The method of claim 1 , wherein the association relationship corresponds to a display brightness value of the display module, and different display brightness values ​​have corresponding association relationships.

3. determining a current display brightness value of the display module; The step of obtaining a gamma voltage of the display module at a basic refresh frequency includes: obtaining a gamma voltage of the display module at a basic refresh frequency at a current display luminance value; The step of obtaining a correlation between the gamma voltage of the display module at a basic refresh frequency and the gamma voltage of the display module at a target refresh frequency includes:

3. The method of claim 2, further comprising: obtaining a correlation between a gamma voltage of the display module at a basic refresh frequency at a current display luminance value and a gamma voltage of the display module at a target refresh frequency.

4. The association relationship includes a proportional relationship, and the step of obtaining the association relationship between the gamma voltage of the display module at a basic refresh frequency and the gamma voltage of the display module at a target refresh frequency at a current display luminance value includes:

4. The method of claim 3, further comprising: obtaining, for each of a plurality of gray scales, a proportional relationship between a gamma voltage of the gray scale at a basic refresh frequency at a current display luminance value and a gamma voltage of the gray scale at a target refresh frequency.

5. The proportional relationship is [Equation 1] is expressed as [Equation 2] represents the grayscale gamma voltage at the target refresh frequency, [Equation 3] represents the gamma voltage of the gray scale at the basic refresh frequency, [Equation 4] 5. The method of claim 4, wherein: represents the gamma ratio.

6. The proportional relationship is a gamma ratio, and the step of obtaining a proportional relationship between the gamma voltage of the gray scale of the display module at a basic refresh frequency at a current display luminance value and the gamma voltage of the gray scale of the display module at a target refresh frequency includes: obtaining gamma ratios of at least two specific grayscales among a plurality of grayscales, the gamma ratios representing ratios between gamma voltages of the grayscales of the display module at a basic refresh frequency at a current display luminance value and gamma voltages of the corresponding grayscales of the display module at a target refresh frequency; and interpolating based on the gamma ratios of the at least two specific grayscales to obtain gamma ratios for each of a plurality of grayscales.

7. The proportional relationship is a gamma ratio, and the step of obtaining the proportional relationship between the gamma voltage of the gray scale at a basic refresh frequency at a current display luminance value and the gamma voltage of the gray scale at a target refresh frequency includes: determining at least two non-basic refresh frequencies among the basic refresh frequency and a plurality of non-basic refresh frequencies, which are close to the target refresh frequency, for each of a plurality of gray scales; and obtaining a gamma ratio for each of the at least two non-basic refresh frequencies, wherein the gamma ratio indicates a ratio between a gamma voltage of the gray scale of the display module at the basic refresh frequency at a current display luminance value and a gamma voltage of a corresponding gray scale of the display module at the non-basic refresh frequency; and interpolating based on the gamma ratios of the at least two non-basic refresh frequencies to obtain the gamma ratio of the target refresh frequency.

8. determining a gamma voltage of the display module at a target refresh frequency according to the gamma voltage of the display module at a basic refresh frequency and the related relationship; 5. The method of claim 4, further comprising: for each of a plurality of gray scales at a current display luminance value of the display module, determining a gamma voltage of the gray scale at the target refresh frequency based on a product of a gamma voltage of the gray scale at a basic refresh frequency and a proportional relationship between the gamma voltage of the gray scale at the basic refresh frequency and the gamma voltage of the gray scale at a target refresh frequency.

9. The association relationship includes a polynomial relationship, and the step of obtaining an association relationship between the gamma voltage of the display module at a basic refresh frequency and the gamma voltage of the display module at a target refresh frequency at a current display luminance value includes:

4. The method of claim 3, further comprising the step of obtaining a plurality of coefficients of a polynomial for expressing a voltage relationship curve between the gamma voltage of each gray scale of the display module at a basic refresh frequency at a current display luminance value and the gamma voltage of each corresponding gray scale of the display module at a target refresh frequency.

10. The polynomial relationship is: [Equation 5] is expressed as [Equation 6] represents the difference between the gamma voltage of a gray scale at the basic refresh frequency and the gamma voltage of the gray scale at the target refresh frequency; [Equation 7] represents the gray scale, [Equation 8] 、 [Equation 9] and [Equation 10] 10. The method of claim 9, wherein x is a coefficient of a polynomial.

11. determining a gamma voltage of the display module at a target refresh frequency according to the gamma voltage of the display module at a basic refresh frequency and the related relationship; 10. The method of claim 9, further comprising: determining a gamma voltage for each gray scale at a target refresh frequency based on the gamma voltages of each of the plurality of gray scales at a basic refresh frequency and the plurality of coefficients at a current display luminance value of the display module.

12. 1. A method for determining a correlation relationship between gamma voltages of a display module, comprising: measuring a gamma voltage of the display module at a basic refresh frequency; measuring gamma voltages of the display module at one or more non-basic refresh frequencies; and determining a correlation relationship between gamma voltages of the display modules based on the gamma voltages of the display modules at a fundamental refresh frequency and the gamma voltages of the display modules at one or more non-fundamental refresh frequencies.

13. The method of claim 12, wherein the association relationship corresponds to a display brightness value of the display module, and different display brightness values ​​have corresponding association relationships.

14. further comprising measuring a current display brightness value of the display module; The step of measuring the gamma voltage of the display module at a basic refresh frequency includes: measuring gamma voltages of a plurality of gray scales of the display module at a basic refresh frequency at a current display luminance value; The step of measuring the gamma voltage of the display module at one or more non-basic refresh frequencies includes:

14. The method of claim 13, further comprising the step of measuring, for each of one or more non-basic refresh frequencies, gamma voltages of a plurality of gray scales of the display module at the non-basic refresh frequency at a current display luminance value.

15. The association relationship includes a proportional relationship, and the step of determining the association relationship between the gamma voltages of the display modules based on the gamma voltages of the display modules at a basic refresh frequency and the gamma voltages of the display modules at one or more non-basic refresh frequencies includes:

15. The method of claim 14, further comprising: determining a gamma ratio for each of one or more non-basic refresh frequencies to indicate a ratio between a gamma voltage of a plurality of grayscales at a basic refresh frequency at a current display luminance value and a gamma voltage of each corresponding grayscale at the non-basic refresh frequency.

16. The association relationship includes a proportional relationship, and the step of determining the association relationship between the gamma voltages of the display modules based on the gamma voltages of the display modules at a basic refresh frequency and the gamma voltages of the display modules at one or more non-basic refresh frequencies includes:

15. The method of claim 14, further comprising: determining a gamma ratio for each of a plurality of grayscales to indicate a ratio between a gamma voltage of the grayscale at a basic refresh frequency at a current display luminance value and a gamma voltage of the grayscale at one or more non-basic refresh frequencies.

17. The association relationship includes a polynomial relationship, and the step of determining the association relationship between the gamma voltages of the display modules based on the gamma voltages of the display modules at a basic refresh frequency and the gamma voltages of the display modules at one or more non-basic refresh frequencies includes:

15. The method of claim 14, further comprising determining a plurality of coefficients of a polynomial to represent a voltage relationship curve between gamma voltages of a plurality of gray scales of the display module at a basic refresh frequency at a current display luminance value and gamma voltages of corresponding plurality of gray scales of the display module at one or more non-basic refresh frequencies.

18. A display device, Memory and a processor coupled to the memory and configured as follows: obtaining a gamma voltage of the display device at a basic refresh frequency; Obtaining a correlation between a gamma voltage of the display device at a base refresh frequency and a gamma voltage of the display device at a target refresh frequency; A display device, characterized in that a gamma voltage of the display device at a target refresh frequency is determined based on the gamma voltage of the display device at a basic refresh frequency and the related relationship.

Images